Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-18-028407-index-headers.html | 2018-11-08 13:03:43 | |
| 0001564590-18-028407-index.html | 2018-11-08 13:03:43 | |
| 0001564590-18-028407.txt | 2018-11-08 13:03:43 | |
 0001564590-18-028407-xbrl.zip | 256901 | 2018-11-08 13:03:43 |
| FilingSummary.xml | 38394 | 2018-11-08 13:03:43 |
| Financial_Report.xlsx | 103350 | 2018-11-08 13:03:43 |
| navg-10q_20180930.htm | 7724484 | 2018-11-08 13:03:43 |
| navg-20180930.xml | 6503913 | 2018-11-08 13:03:43 |
| navg-20180930.xsd | 57922 | 2018-11-08 13:03:43 |
| navg-20180930_cal.xml | 107498 | 2018-11-08 13:03:43 |
| navg-20180930_def.xml | 295841 | 2018-11-08 13:03:43 |
| navg-20180930_lab.xml | 512969 | 2018-11-08 13:03:43 |
| navg-20180930_pre.xml | 452801 | 2018-11-08 13:03:43 |
| navg-ex111_8.htm | 71360 | 2018-11-08 13:03:43 |
| navg-ex311_7.htm | 17980 | 2018-11-08 13:03:43 |
| navg-ex312_9.htm | 17983 | 2018-11-08 13:03:43 |
| navg-ex321_6.htm | 8029 | 2018-11-08 13:03:43 |
| navg-ex322_10.htm | 8039 | 2018-11-08 13:03:43 |
| R1.htm | 25636 | 2018-11-08 13:03:43 |
| R10.htm | 65252 | 2018-11-08 13:03:43 |
| R11.htm | 1314266 | 2018-11-08 13:03:43 |
| R12.htm | 881615 | 2018-11-08 13:03:43 |
| R13.htm | 281915 | 2018-11-08 13:03:43 |
| R14.htm | 104801 | 2018-11-08 13:03:43 |
| R15.htm | 61891 | 2018-11-08 13:03:43 |
| R16.htm | 5785 | 2018-11-08 13:03:43 |
| R17.htm | 5897 | 2018-11-08 13:03:43 |
| R18.htm | 9434 | 2018-11-08 13:03:43 |
| R19.htm | 63467 | 2018-11-08 13:03:43 |
| R2.htm | 88175 | 2018-11-08 13:03:43 |
| R20.htm | 5929 | 2018-11-08 13:03:43 |
| R21.htm | 6023 | 2018-11-08 13:03:43 |
| R22.htm | 61161 | 2018-11-08 13:03:43 |
| R23.htm | 51044 | 2018-11-08 13:03:43 |
| R24.htm | 1314413 | 2018-11-08 13:03:43 |
| R25.htm | 882482 | 2018-11-08 13:03:43 |
| R26.htm | 278854 | 2018-11-08 13:03:43 |
| R27.htm | 106099 | 2018-11-08 13:03:43 |
| R28.htm | 57592 | 2018-11-08 13:03:43 |
| R29.htm | 61227 | 2018-11-08 13:03:43 |
| R3.htm | 24382 | 2018-11-08 13:03:43 |
| R30.htm | 46297 | 2018-11-08 13:03:43 |
| R31.htm | 47354 | 2018-11-08 13:03:43 |
| R32.htm | 41762 | 2018-11-08 13:03:43 |
| R33.htm | 10012 | 2018-11-08 13:03:43 |
| R34.htm | 89699 | 2018-11-08 13:03:43 |
| R35.htm | 63354 | 2018-11-08 13:03:43 |
| R36.htm | 67066 | 2018-11-08 13:03:43 |
| R37.htm | 15528 | 2018-11-08 13:03:43 |
| R38.htm | 43636 | 2018-11-08 13:03:43 |
| R39.htm | 32690 | 2018-11-08 13:03:43 |
| R4.htm | 76977 | 2018-11-08 13:03:43 |
| R40.htm | 81876 | 2018-11-08 13:03:43 |
| R41.htm | 18837 | 2018-11-08 13:03:43 |
| R42.htm | 36517 | 2018-11-08 13:03:43 |
| R43.htm | 11330 | 2018-11-08 13:03:43 |
| R44.htm | 16067 | 2018-11-08 13:03:43 |
| R45.htm | 97466 | 2018-11-08 13:03:43 |
| R46.htm | 14096 | 2018-11-08 13:03:43 |
| R47.htm | 12398 | 2018-11-08 13:03:43 |
| R48.htm | 26338 | 2018-11-08 13:03:43 |
| R49.htm | 17190 | 2018-11-08 13:03:43 |
| R5.htm | 34712 | 2018-11-08 13:03:43 |
| R50.htm | 30674 | 2018-11-08 13:03:43 |
| R51.htm | 13195 | 2018-11-08 13:03:43 |
| R52.htm | 6878 | 2018-11-08 13:03:43 |
| R53.htm | 21738 | 2018-11-08 13:03:43 |
| R54.htm | 11227 | 2018-11-08 13:03:43 |
| R55.htm | 25013 | 2018-11-08 13:03:43 |
| R56.htm | 7787 | 2018-11-08 13:03:43 |
| R57.htm | 28913 | 2018-11-08 13:03:43 |
| R58.htm | 7781 | 2018-11-08 13:03:43 |
| R59.htm | 11031 | 2018-11-08 13:03:43 |
| R6.htm | 15347 | 2018-11-08 13:03:43 |
| R60.htm | 24651 | 2018-11-08 13:03:43 |
| R7.htm | 43869 | 2018-11-08 13:03:43 |
| R8.htm | 101050 | 2018-11-08 13:03:43 |
| R9.htm | 46482 | 2018-11-08 13:03:43 |
| report.css | 2767 | 2018-11-08 13:03:43 |
| Show.js | 1085 | 2018-11-08 13:03:43 |